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I took a look at the the website of the makers of the SharkTap. It seems that the SharkTap USB has a built-in USB-Ethernet adapter so you do not need to add an external one. What is the reason you are using a separate one? Did you also try using the built-in USB-ethernet adapter to capture on?
As for not seeing the IP adresses of the HMI and PLC, are they both directly connected to the SharkTap NETWORK interfaces? So no switches, hubs etc involved? If so, did you enable "Promiscuous mode" on the capture interface (the external USB-Ethernet adapter)? And do you know for sure this adapter supports "promiscuous mode"?
